在神光Ⅲ原型装置上利用八路6400 J/1 ns激光注入1100 μm×1850 μm的黑腔内产生210 eV的高温辐射场,均匀辐照填充氘氘燃料的靶丸实现内爆.实验中选择高气压薄壳靶丸实现纯冲击波聚心内爆.通过闪烁体探测器、中子条纹相机等多套诊断设备获取了中子产额、聚变反应时刻等关键内爆参数.结合一维数值模拟表明,实验测量的中子产额与干净一维数值模拟计算的中子产额之比达到90%;同时通过人为破坏内爆对称性等方式表明,该设计下内爆中子产生机制集中于冲击波聚心,其内爆性能受到高维因素影响极低,从而实现了准一维内爆.

The D-D filled capsule implosion experiment is performed on Shenguang Ⅲ prototype laser facility.One-dimensional hydrodynamic numerical simulations show that neutron yield mechanism can be controlled by different D-D gas pressure and CH shell thickness.In experiments,the high gas filling pressure and thin shell thickness capsule is proposed for shock yield only implosion design.Meantime,many important implosion parameters such as neutron yield,bang-time are collected.The optimized experimental neutron yield is 9.9×107 (±9.7%) and the ratio between the experimental value and the 1D simulated value reached 90%.On the other hand,two types of unregular targets (extra high asymmetry and RT instability) are designed and experiments are proposed.The experimental results show that the multi-dimensional factors have little influence on implosion performance.Finally,the quasi-one-dimensional implosion is achieved based on high pressure and thin shell target.